Biome's linter has a total of 220 rules
\ No newline at end of file +
Biome's linter has a total of 221 rules
\ No newline at end of file
diff --git a/src/content/docs/linter/rules/index.mdx b/src/content/docs/linter/rules/index.mdx
index 3e61673d7..55e68f4d7 100644
--- a/src/content/docs/linter/rules/index.mdx
+++ b/src/content/docs/linter/rules/index.mdx
@@ -280,5 +280,6 @@ Rules that belong to this group are not subject to semantic version🔧 |
| [noRestrictedImports](/linter/rules/no-restricted-imports) | Disallow specified modules when loaded by import or require. | |
| [noUndeclaredDependencies](/linter/rules/no-undeclared-dependencies) | Disallow the use of dependencies that aren't specified in the package.json. | |
+| [noUnknownUnit](/linter/rules/no-unknown-unit) | Disallow unknown CSS units. | |
| [useImportRestrictions](/linter/rules/use-import-restrictions) | Disallows package private imports. | |
| [useSortedClasses](/linter/rules/use-sorted-classes) | Enforce the sorting of CSS utility classes. | ⚠️ |
diff --git a/src/content/docs/linter/rules/no-unknown-unit.md b/src/content/docs/linter/rules/no-unknown-unit.md
new file mode 100644
index 000000000..e310bec0a
--- /dev/null
+++ b/src/content/docs/linter/rules/no-unknown-unit.md
@@ -0,0 +1,109 @@
+---
+title: noUnknownUnit (not released)
+---
+
+**Diagnostic Category: `lint/nursery/noUnknownUnit`**
+
+:::danger
+This rule hasn't been released yet.
+:::
+
+:::caution
+This rule is part of the [nursery](/linter/rules/#nursery) group.
+:::
+
+Sources:
+- Same as: stylelint/unit-no-unknown
+
+Disallow unknown CSS units.
+
+For details on known CSS units, see the [MDN web docs](https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Values_and_units#lengths).
+
+## Examples
+
+### Invalid
+
+```css
+a {
+ width: 10pixels;
+}
+```
+
+
+
+```css
+a {
+ width: calc(10px + 10pixels);
+}
+```
+
+nursery/noUnknownUnit.js:2:12 lint/nursery/noUnknownUnit ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+ ✖ Unexpected unknown unit: pixels
+
+ 1 │ a {
+ > 2 │ width: 10pixels;
+ │ ^^^^^^
+ 3 │ }
+ 4 │
+
+ ℹ See MDN web docs for more details.
+
+ ℹ Use a known unit instead, such as:
+
+ - px
+ - em
+ - rem
+ - etc.
+
+
+
+### Valid
+
+```css
+a {
+ width: 10px;
+}
+```
+
+```css
+a {
+ width: 10Px;
+}
+```
+
+```css
+a {
+ width: 10pX;
+}
+```
+
+```css
+a {
+ width: calc(10px + 10px);
+}
+```
+
+## Related links
+
+- [Disable a rule](/linter/#disable-a-lint-rule)
+- [Rule options](/linter/#rule-options)
nursery/noUnknownUnit.js:2:24 lint/nursery/noUnknownUnit ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+ ✖ Unexpected unknown unit: pixels
+
+ 1 │ a {
+ > 2 │ width: calc(10px + 10pixels);
+ │ ^^^^^^
+ 3 │ }
+ 4 │
+
+ ℹ See MDN web docs for more details.
+
+ ℹ Use a known unit instead, such as:
+
+ - px
+ - em
+ - rem
+ - etc.
+
+